Adds heartbeat_tick tool that automates task pickup across all projects:
- Runs session health checks (zombie cleanup) before pickups
- Loops over all registered projects
- Picks up tasks by priority (To Improve > To Test > To Do)
- Supports two work modes:
- parallel: each project can have DEV+QA running independently
- sequential: only 1 DEV + 1 QA globally (can be different projects)
- Respects per-project maxDevWorkers/maxQaWorkers settings
- Supports dryRun mode and maxPickups limit
- Context guard: only works from DM/cron, blocks project groups
Also adds:
- workMode config option (parallel | sequential)
- maxDevWorkers/maxQaWorkers fields to Project type
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